laboursonline – MCQs, Mock Tests | Biology Biology MCQS section -4

Which one of the following has a bilateral symmetry in its body organization?

1. Asterias
2. Sea anemone
3. Nereis
4. Euchinus

✅ Correct Answer: 1

Which of the following statements is not true about metabolism?

1. Younger people generally have a slower metabolism than adults.
2. Basal metabolism is the amount of energy needed for sustaining life.
3. Basal metabolism is measured by the amount of calories burned when your body is inactive.
4. Metabolism is influenced by numerous factors, such as heredity and a?

✅ Correct Answer: 1

Which describes how mRNA is used by a cell?

1. It is used to move information to other cells
2. It is used to check DNA for mutations.
3. It is used to replicate DNA for mitosis.
4. It is used to transfer genetic information.

✅ Correct Answer: 4

Which of the following does not occur during Mitosis?

1. spindle formation
2. condensation of the chromosomes
3. breakdown of the nuclear membrane
4. replication of the DNA

✅ Correct Answer: 4

Where does glycolysis take place in Eukaryotic cells?

1. Mitochondrial Outer membrane
2. Cytoplasm
3. Mitochondrial inner membrane
4. None of the above

✅ Correct Answer: 2

Which event occurs during interphase?

1. Centrioles appear
2. Spindle fibers begin to form
3. The cell grows
4. Centromeres divide

✅ Correct Answer: 3

The animals in which the body cavity is absent are known as __________.

1. Coelomates
2. Wild
3. Pseudocoelomates
4. Acoelomates

✅ Correct Answer: 4

Appetite is triggered by

1. stomach enzymes
2. pancreatic enzymes
3. physiological drive
4. environmental cues such as the smell or taste of food

✅ Correct Answer: 4

What sugar is found in DNA?

1. Ribose
2. Deoxyribose
3. Pentose
4. Sucrose

✅ Correct Answer: 2

As an infant, the ability to produce antibodies is

1. about 80% of that of an adult
2. nonexistent
3. limited
4. the same as an adult

✅ Correct Answer: 3

Which of the following is a feature of ghrelin?

1. It stimulates appetite and energy storage
2. It is released in high amounts from adipocytes during periods of excess energy intake
3. The blood level in the fasting state correlates directly with body weight
4. It is a metabolic antagonist of leptin

✅ Correct Answer: 1

Which occurs during transcription?

1. Proteins are produced
2. Ribosomes produces
3. DNA information is copied to RNA
4. All of the above

✅ Correct Answer: 3

Which of the following statements is most accurate regarding infection with parvovirus B19?

1. Parvovirus B19 causes severe anemia because it preferentially infects erythrocyte precursors
2. Parvovirus B19 can cause hydrops fetalis via transplacental infection of a fetus in a seropositive mother
3. Parvovirus B19 can be diagnosed by detection of viral RNA using PCR or hybridization assays
4. Parvovirus B19 replicates in the host cell nucleus utilizing a virally encoded DNA polymerase to create a double- stranded DNA intermediate

✅ Correct Answer: 1

Which one of the following is true of tRNAs?

1. tRNAs are double-stranded.
2. There are four types of tRNA.
3. Each tRNA binds a particular amino acid.
4. All of the above

✅ Correct Answer: 3

What molecule carries genetic information?

1. RNA
2. DNA
3. Proteins
4. Nucleotides

✅ Correct Answer: 2

The hormone that stimulates heart beat is

1. Thyroxine
2. Gastrin
3. Glycogen
4. Dopamine

✅ Correct Answer: 1

The main result of aerobic respiration is the

1. production of lactic acid as an end product
2. production of ATP from the breakdown of glucose
3. conversion of radiant energy into chemical energy
4. storage of energy in a polysaccharide

✅ Correct Answer: 2

Which statement correctly describes the role of chance in evolution?

1. An allele that increases evolutionary fitness cannot be lost from a population by chance events.
2. The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
3. Evolutionary change proceeds by an accumulation of changes that occur by chance.
4. None of the above

✅ Correct Answer: 2

How many Nucleotides make up a Codon?

1. 3
2. 4
3. 5
4. 6

✅ Correct Answer: 1

Tubes that bifurcate from the windpipe

1. Bronchi
2. pleura
3. Apex
4. Adenoids

✅ Correct Answer: 1

Most of the oxygen transported by the blood is

1. bound to hemoglobin
2. dissolved in plasma
3. dissolved in water
4. in ionic form as solute in plasma

✅ Correct Answer: 1

Nucleotides are attached by bonds between the

1. phosphates and sugars
2. nitrates and sugars
3. nitrates and phosphates
4. sugars and hydrates

✅ Correct Answer: 1

Which of the following group produces naked seeds?

1. Angiosperms
2. Bryophyta
3. Thallophyte
4. Gymnosperms

✅ Correct Answer: 4

Menstruation is triggered by a drop in the levels of

1. progesterone
2. relaxin
3. FSH
4. LH

✅ Correct Answer: 1

Most absorption of nutrients occurs in the

1. Stomach
2. Liver
3. Large intestine
4. Small intestine

✅ Correct Answer: 4

Select the correct statement about the uterine cycle.

1. During the secretory phase, estrogen levels are at their highest.
2. During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone.
3. If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.
4. The menstrual phase of the cycle is from day 1 to day 8.

✅ Correct Answer: 3

Which part of the brain is responsible for consciousness?

1. Brain stem
2. Cerebrum
3. Cerebellum
4. None of the above

✅ Correct Answer: 2

Which phrase best describes rough ER?

1. studded with ribosomes
2. fewer solutes than the cell
3. stored in the central vacuole
4. protected by vesicles

✅ Correct Answer: 1

In plants, chloroplasts are necessary for

1. photosynthesis
2. storage
3. cell movement
4. respiration

✅ Correct Answer: 1

A viral species is a group of viruses that

1. same ecological niche
2. same genetic information
3. both A & B
4. None of the above

✅ Correct Answer: 3

Which is not a basic function of a cell?

1. stopping homeostasis from happening
2. obtaining and storing energy
3. removing waste
4. transferring genetic information

✅ Correct Answer: 1

What carries Blood away from the Heart?

1. Arteries
2. Veins
3. Both A & B
4. None

✅ Correct Answer: 1

Oxygenated blood flows through which vessel?

1. Pulmonary Veins
2. Pulmonary Arteries
3. Both A & B
4. None of the above

✅ Correct Answer: 1

Where does translation occur?

1. Nucleus
2. Ribosomes
3. Cytoplasm
4. mitochondrion

✅ Correct Answer: 3

Receptors for hearing are located in the

1. Vestibule
2. Tympanic membrane
3. Semicircular canals
4. Cochlea

✅ Correct Answer: 4

The HIV retrovirus is particularly deadly because

1. I can become AIDS shortly afte being contracted
2. It attacks the body immune system
3. Treatments can be dangerous for patients
4. Its hard to diagnose accurately

✅ Correct Answer: 2

Where are chromatids found in a cell?

1. Anaphase
2. Metaphase
3. Prophase
4. None of the above

✅ Correct Answer: 2

Bleeding of gums, falling of teeth, fragile bones and delayed wound healing occur due to the deficiency of which one of the following vitamins?

1. Vitamin C
2. Vitamin K
3. Vitamin D
4. Vitamin B

✅ Correct Answer: 1

Fat is completely digested in the

1. small intestine
2. mouth
3. large intestine
4. stomach

✅ Correct Answer: 1

Self pollination will lead to

1. Inbreeding
2. Over breeding
3. Outbreeding
4. Rare breeding

✅ Correct Answer: 1

The organs protected by the thoracic cage include the

1. lungs
2. heart
3. both a & b
4. None of the above

✅ Correct Answer: 3

Deficiency of fluoride leads to Which one of the following health problems?

1. Tooth caries
2. Mottling of tooth
3. Bending of bones
4. Stiffening of joints

✅ Correct Answer: 1

What is the correct order for Respiration?

1. Election transport chain- Krebscycle- glycolysis
2. Glycolysis – Krebscycle electron transport chain
3. Glycolysis – electron transport chain – Krebs cycle
4. The Krebs cycle - electron transport chain - glycolysis

✅ Correct Answer: 2

Which of the following is an example of polygenic inheritance?

1. Skin pigmentation in humans
2. Huntington?s disease in humans
3. White and purple flower color in peas
4. The ABO blood groups in humans

✅ Correct Answer: 1

What sugar is found in RNA?

1. Deoxyribose
2. Ribose
3. Pentose
4. Sucrose

✅ Correct Answer: 2

Which systems comprise the nervous system?

1. Central nervous system
2. Peripheral nervous system
3. Both A & B
4. None of the above

✅ Correct Answer: 3

A plant that does NOT grow through vegetative propagation is ............

1. Rose
2. Papaya
3. Banana
4. Orange

✅ Correct Answer: 2

The lining of the marrow cavity is

1. Endosteum
2. Sarcolemma
3. Episteum
4. Periosteum

✅ Correct Answer: 1

Bacteria divide by

1. Binary Fission
2. Spirilla
3. RNA
4. Fusion

✅ Correct Answer: 1

What is the function of reverse transcriptase?

1. synthesis of RNA from protein
2. synthesis of DNA from an RNA template
3. synthesis of protein from DNA
4. synthesis of DNA from protein

✅ Correct Answer: 2