The leaves of a plant are the main organs where photosynthesis occurs. Which of the following best describes how their structure is related to this function?
A) Most leaves contain all the structures that the plant requires to reproduce.
B) Leaves are covered by a waxy cuticle that prevents water loss.
C) The leaves are covered with tiny hairs that allow for more water absorption.
D) Most leaves are broad and flat to absorb maximum sunlight.
Answer: D) Most leaves are broad and flat to absorb maximum sunlight.
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In long-day plants,
a. extended daylight produces more Pfr. b. the number of hours of darkness must be less than a critical value. c. the interruption of the dark period does not upset the flowering sequence. d. flowering is limited to summertime under normal conditions. e. all of these occur.
In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH. In this reaction, what happened to NAD+?
A. It was activated to form NADH B. It was oxidized to form NADH C. It was reduced to form NADH D. it served as an enzyme to catalyze the reaction, and at the end of the reaction formed NADH
Compare and contrast mitosis and meiosis using words, diagrams or both
What will be an ideal response?
Why have some microbiologists proposed using ribosomal RNA as the basis for defining bacterial species?
A. Ribosomal RNAs are highly conserved genetic sequences present in all prokaryotes. B. the "interbreeding population" criterion does not apply to bacteria. C. ribosomal RNA is the basis for domain assignment. D. bacteria vary too little in their physical and biochemical traits. E. bacteria are not interbreeding populations, and ribosomal RNAs are highly conserved genes present in all prokaryotes.