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SAT Biology (Molecular) → Sample test questions from 11 to 20

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11. Which of the following statements about the lac operon is NOT true?
(A) RNA polymerase can be blocked by an active repressor protein attached to the operator
(B) RNA polymerase attaches at a site on the DNA strand, known as the promoter
(C) There is a regulatory gene that is downstream from the structural genes that can inhibit transcription
(D) The regulatory gene produces the active repressor
(E) The repressor protein can be activated by a substance like lactose, called the inducer

12. Which of the following statements about the HIV virus is NOT true?
(A) The viral nucleotides contain ribose
(B) HIV contains uracil, not thymine
(C) HIV infection begins with the entrance of the virus into the host when the gp 120 and gp 41 function to pull the virus across the plasma membrane
(D) HIV makes the host cell produce reverse transcriptase
(E) Immunization against HIV has proven difficult because the virus mutates so rapidly

13. All of the following are means of posttranscriptional control in eukaryotes EXCEPT
(A) the capping of the 58 end with a modified guanosine triphosphate
(B) the addition of a poly-A tail to the 38 end
(C) the cutting out of introns by a spliceosome
(D) the ligation of exons by DNA polymerase
(E) the attachment of signal sequences for direction to specific destinations

14. Which of the following statements is NOT true concerning restriction fragment length polymorphisms (RFLPs)?
(A) Suspects whose fragments do not match any other fragments at a crime scene can be vindicated
(B) The polymerase chain reaction can be used to produce more copies of DNA obtained at a crime scene before RFLP analysis
(C) Most RFLPs use radioactive probes
(D) Most RFLPs occur because of the repetitive nature of DNA
(E) With the advent of PCR technology, restriction enzymes are no longer needed to perform RFLP analysis

15. The number of tRNA molecules required by eukaryotic organisms to ferry around the amino acids is
(A) 64
(B) 63
(C) 45
(D) 23
(E) 20

16. A student using a compound microscope with a 10X ocular lens and a 4X objective lens measured his field of view with a plastic ruler and found it to be 4 mm. He then placed some of his cheek cells on a slide, found them using the 4X objective lens and switched to the 40X objective lens. He counted twelve cells, side by side, that stretched from one side of the field of view to the other. What is the best estimate for the diameter of a cheek cell?
(A) 0.033 mm
(B) 0.132 mm
(C) 0.0132 mm
(D) 0.0033 mm
(E) 1.32 mm

17. In fruit flies, the gray body color is dominant to the black, and long wings are dominant to short. If you crossed a gray, short-winged fly to a black, long-winged fly and got 25 percent gray, long wing; 25 percent gray, short wing; 25 percent black, short wing; and 25 percent black, long wing, what were the genotypes of the parental flies?
(A) Ggll and GgLl
(B) Ggll and ggLl
(C) GGll and ggLl
(D) GGll and GgLl
(E) Ggll and ggLL

18. Which of the following statements about mitochondria is (are) true?
(A) Mitochondria exist in all eukaryotes
(B) Mitochondria exist in bacteria and plants
(C) Mitochondria exist in animals, plants, and fungi
(D) Both (B) and (C) are true
(E) Both (A) and (C) are true

19. The flowing cytoplasm of an active amoeba is
(A) propelled by microfilaments for lipid synthesis
(B) an adaptation for extracellular digestion
(C) composed of microtubules and extracellular matrix
(D) dependent on microfilaments for intracellular circulation
(E) required for nerve transmission

20. In the earthworm, the efficiency of food absorption is increased by the presence of
(A) the liver, which stores extra food in addition to making metabolic enzymes
(B) the cecum, which stores unsuitable intake for excretion
(C) infolds, which add surface area to the intestine
(D) malphigian tubules, which increase the density of the food
(E) the liver, which absorbs excess sugar and stores it as glycogen

ANSWERS: SAT BIOLOGY SAMPLE TEST QUESTIONS
11. C
12. D
13. D
14. E
15. C
16. A
17. B
18. E
19. D
20. C