What is a testcross?
A. a cross between two organisms of different species
B. a cross between an organism of unknown genotype with a homozygous recessive individual
C. any genetics cross you do in order to test a hypothesis
D. a cross between two true-breeding individuals (such as we see in the P generation)
E. any genetics cross you see on an exam
Answer: B
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Which of the following are effective treatments for some allergic reactions?
I) antihistamines II) epinephrine III) corticosteroids A) only I and III B) only II and III C) only I and IIII D) I, II, and III
By using enzymes that destroyed DNA, RNA, or protein, Avery and colleagues were able to determine which of the three molecules was required to transform bacterial cells.
Answer the following statement true (T) or false (F)
Which of the following plants are NOT
monocots?
a. lilies b. palms c. cacti d. grasses e. orchids
Why are action potentials usually conducted in one direction?
A) The nodes of Ranvier conduct potentials in one direction. B) The brief refractory period prevents reopening of voltage-gated Na+ channels. C) The axon hillock has a higher membrane potential than the terminals of the axon. D) Voltage-gated channels for both Na+ and K+ open in only one direction.