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SAT Biology (Molecular) → Sample paper test questions from 21 to 30

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21. A consensus sequence is associated with __________, while a signal sequence is part of __________.
(A) translation, hnRNAs
(B) DNA, translation
(C) transcription, a snurp
(D) hnRNA, a snurp
(E) spliceosomes, translation

22. One would expect to find steroid hormone receptors in the
(A) plasma membrane
(B) endoplasmic reticulum
(C) nucleus
(D) cytosol
(E) none of the above

23. Plants produce energy in their
I. cytosol
II. mitochondria
III. chloroplast
(A) I only
(B) II only
(C) III only
(D) II and III
(E) I, II, and III

24. Select the correct order of events in a person’s response to a bacterial infection:
(A) macrophage ingestion – Helper T cell activation – B cell activation – clonal formation
(B) clonal formation – Helper T cell activation – B cell activation – macrophage ingestion
(C) macrophage ingestion – B cell activation – T helper cell activation – clonal formation
(D) Helper T cell activation – B cell activation – macrophage ingestion – clonal formation
(E) B cell activation – T helper cell activation – clonal formation – macrophage ingestion

25. People who have an extra X chromosome could have gotten it through
(A) non-disjunction
(B) transposition
(C) transduction
(D) crossing over
(E) all of the above

26. The HIV virus infects mostly
(A) complement cells
(B) red blood cells
(C) T-killer cells
(D) T-helper cells
(E) all of the above

27. Which of the following functions can be attributed to DNA polymerase?
(A) It replaces RNA nucleotides with DNA nucleotides
(B) It fixes errors in the replication of DNA
(C) It ads nucleotides to the growing chain at the 3′ end
(D) It is used in the polymerase chain reaction
(E) All of the above are true

28. During translation, the first amino acid
(A) occupies the aminyl site first, then the peptidyl site
(B) occupies the aminyl site before the attachment of the large portion of the ribosome
(C) of the polypeptide chain is methionine
(D) all of the above
(E) none of the above

29. A signal sequence
(A) is a sequence of DNA that begins transcription
(B) is a sequence of RNA that is spliced out in the nucleus
(C) is a sequence of DNA that directs a protein to certain organelles
(D) is a sequence of DNA that attracts transcription factors
(E) is the sequence of tRNA that bonds with the codon of mRNA at the ribosome

30. Northern blotting is used with
(A) DNA
(B) RNA
(C) hnRNA
(D) ssDNA
(E) all of the above

ANSWERS: SAT BIOLOGY (MOLECULAR) SAMPLE PAPER
21. E
22. C
23. E
24. A
25. A
26. D
27. E
28. C
29. C
30. B