When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
Answer: C
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Consider three different enzymes (identified as 1-3, below), each of which has a unique complement of three amino acids that are crucial for the binding of the substrate at the active site
Select from choices A-D the characteristic you would predict a substrate would possess that would bind to an active site where these amino acids are present. (Consult Figure 4.2 in Chapter 4 to help you make your predictions.) Enzyme 1: leucine, tryptophan, and alanine A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
One type of archaeon, Haloquadratum walsbyi, is shaped like a postage stamp with dimensions of 2 µm x 3 µm x 0.25 µm. What advantage would this shape provide?
A. This shape is more conducive to the formation of biofilm communities. B. This shape increases the surface to volume ratio enabling more efficient nutrient uptake. C. This shape is difficult for phagocytic cells to attach to and engulf. D. This shape enables this bacteria to float on surfaces and obtain better light exposure.
Blue light has energy than red light and is by a green leaf.
A. less; absorbed B. more; absorbed C. more; reflected D. less; reflected E. equal; reflected
In cardiovascular disease, "MI" refers to
A. high blood cholesterol. B. a heart attack. C. a stroke. D. narrowed arteries.