The fossil record suggests that whales ________
A) are descended from one branch of marine reptiles
B) are closely related to land mammals such as pigs, hippos, and cows
C) are not closely related to dolphins and porpoises, despite a superficial similarity
D) once had well-developed hind flippers
B
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Cytoplasmic determinants are ____
a. key mRNA and proteins stored in the sperm cytoplasm that direct the early stages of development b. key mRNA and proteins stored in the egg cytoplasm that direct the early stages of development c. evenly distributed throughout the egg cell d. distributed symmetrically to daughter cells e. proteins from the egg and sperm cytoplasm that interact to form novel protein complexes in the zygote
Yogurt contains galactose and glucose, which are generated when bacterial enzymes act on milk sugars. What is the main source of the galactose in yogurt?
A. maltose B. lactose C. glycogen D. fructose E. sucrose
Beta-lactam antibiotics such as penicillins, have an effect on which of the following types of cells?
A) animal cells B) bacterial cells C) fungal cells D) virus-infected cells E) both animal and fungal cells
Each nucleotide in DNA and RNA has an aromatic base. What is the principal force that keeps the bases in a polymer from interacting with water?
(a) hydrophobic interactions (b) hydrogen bonds (c) covalent bonds (d) van der Waals interactions