HESI A2 BIOLOGY MULTIPLE CHOICE QUESTIONS EXAM

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HESI A2 BIOLOGY MULTIPLE CHOICE QUESTIONS EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -74 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: which of the following describes why small sections of DNA are lost during replication?

• the sections of DNA between Okazaki fragments cannot be recovered

b) DNA polymerase cannot replicate the end of the DNA strand

c) DNA cannot be read in the 5' to 3' direction

• the initiator proteins bind only one strand of DNA

Answer:

b) DNA polymerase cannot replicate the end of the DNA strand: DNA polymerase cannot replicate the

end of a DNA strand, so that section of the DNA is lost during replication

Question 2: which of the following is NOT present in an animal cell?

• nucleus
• mitochondria
• cytoplasm

• cell wall

Answer:

• cell wall: the cell wall is the structure that gives plat cells their rigidity

Question 3: in a certain plant, having the dominant allele R results in the bright-red seeds, and the recessive allele r results in pale-pink seeds. in the first generation, a scientist crosses a true-breeding RR plant with a recessive rr plant. the F1 plant is then crossed with itself, resulting in the F2 generation. in the F2 generation, what percentage of the plants will have bright-red seeds?

• 25 percent
• 50 percent
• 75 percent
• 100 percent

Answer:

• 75 percent: the F1 generation will have all the genotype Rr. in the F2 generation, 75 percent of the

plants will carry the dominant R allele Question 4: which of the following correctly lists the cellular hierarchy from the simplest to the most complex structure?

• organ system, organism, organ, tissue, cell
• tissue, cell, organ, organ system, organism
• organism, organ system, organ, tissue, cell
• cell, tissue, organ, organ system, organism

Answer:

• cell, tissue, organ, organ site, organism

Question 5: photosynthesis involves:

• carbon dioxide and water converting to glucose, not requiring light
• carbon dioxide and water converting into glucose, requiring light
• cyanobacteria converting chlorophyll into energy

• cyanobacteria forming cellular respiration and glucose conversion

Answer:

• carbon dioxide and water converting into glucose, requiring light

Question 6: true or false: gradualism describes the process of evolution as involving long periods without significant change, or stasis

Answer:

false

Question 7: which of the following sentences is true?

• some organisms begin life as a single cell and others as multicellular
• all organisms begin life as a single cell
• all organisms begin life as multicellular
• none of these answer choices

Answer:

• all organisms begin life as a single cell

Question 8: a scientist takes DNA samples from a cell culture at two different times, each same having the same cell count. in the first sample, he finds that there is a 6.5 pg of DNA whereas in the second sample, he finds that there is a 13 pg of DNA. which state of the cell cycle is the first sample in?

• interphase G1
• interphase S
• interphase G2
• mitotic phase

Answer:

• interphase G1: during the G1 phase of interphase, the cell has not replicated its DNA, doubling the

amount of DNA in the cell

Question 9: mature RBCs are adapted to not contain a nucleus. this allows them to carry more hemoglobin. as a result of this adaption, RBCs

• cannot undergo mitosis
• have large energy reserves
• never die
• reproduce quickly

Answer:

• cannot undergo mitosis: RBCs are created in bone marrow instead of going through mitosis. they are

thinly type of cell created to be this way. without a nucleus, RBCs are unable to go mitosis Question 10: which term refers to a cell with two sets of chromosomes (one from each parent)?

• chromatids
• haploid
• diploid
• cell cycle

Answer:

• diploid

Question 11: true or false: the final electron acceptor in anaerobic respiration is oxygen.

Answer:

false Question 12: which of the following pairs of organelles perform similar functions?

• the nucleus and ribosomes
• vacuoles and mitochondria
• chloroplasts and mitochondria
• ribosomes and chloroplasts

Answer:

• chloroplasts and mitochondria: these two organelles use an ATP synthase to generate ATP