Which of the following parts of a plant embryo grows downward?
Select one:
a. plumule
b. epicotyl
c. seed coat
d. radicle
e. shoot
d. radicle
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The DTaP vaccine contains
A) purified bacterial DNA. B) bacterial endotoxin derivatives. C) heat-killed Bordetella pertussis cells. D) diphtheria toxoid.
What is the function of the capsule of a bacterial cell?
A) it is used during cell division B) it allows the bacteria to be resist to antibiotics C) is it sued to transfer DNA from one cell to another D) it prevents phagocytosis
The morphospecies concept is broadly applicable but has disadvantages. Which of the following scenarios illustrates a disadvantage of using appearance to distinguish species?
A. Two beetles are almost identical except that one has larger antennae. Scientists disagree whether this difference is sufficient to name the two beetles as different species. B. Dogs are highly variable yet can interbreed. C. Some butterflies in the Amazon are almost identical, yet biologists have determined from phylogenetic analysis that they have arisen from different groups within the butterflies. D. All of the listed responses are correct.
Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed. Give the phenotypes (with
frequencies) of the offspring. A) 12 white : 3 yellow : 1 green B) 3 white : 9 yellow : 4 green C) 4 white :9 yellow : 3 green D) 12 white : 1 yellow : 3 green E) 9 white : 3 yellow : 4 green