What is the function of companion cells?
A. These cells provide metabolic support to vessel elements.
B. These cells provide metabolic support to sieve elements.
C. These cells provide metabolic support to tracheids.
D. These cells prevent water from entering the endodermis.
E. These cells control the opening and closing of stomata.
Answer: B
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In humans, a diploid organism, an individual’s genotype includes ____ of each autosomal gene
a. one copy b. two copies c. hundreds of copies d. thousands of copies e. millions of copies
The light-dependent generation of NADPH is referred to as ________
Fill in the blank with correct word.
Suppose a new species of bacterium is discovered. It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand. All other properties of the enzyme remain unchanged. How would DNA replication in these bacteria differ from normal replication?
A. DNA gyrase would no longer be required for replication. B. Both new strands could be synthesized continuously like the leading strand. C. The same polymerase molecule could synthesize both strands at the same time. D. Helicase would no longer be required for replication.
Inductive reasoning
What will be an ideal response?