The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. As a result, pepsin affects which macromolecule?
A. carbohydrate
B. protein
C. DNA
D. lipid
B. protein
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An animal virus contains protein, lipid, and DNA. Shown here is the absorption spectra of the three macromolecules purified from the virus. Which of the three samples, A, B, or C, contains DNA?
A. Sample A contains DNA. B. Sample B contains DNA. C. Sample C contains DNA.
What is the map distance between sn and ct?
In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild-type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:
A) 12 m.u.
B) 13 m.u.
C) 25 m.u.
D) 50 m.u.
E) 75 m.u.
In all Mendel's crosses, it did not matter which phenotype was used as the male or as the female
parent. Indicate whether the statement is true or false.
The primary role of a cytokinin is
a. fruit drop b. cell division c. fruit ripening d. promote flowering e. stress response