In flowering plants, pollen represents the
A) zygote. B) haploid stage. C) diploid stage.
B
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Why is there a problem replicating the ends of linear DNA?
A. Leading strand synthesis primed at the replication origin of a linear DNA can't remove and replace the primer. B. Lagging strand synthesis primed at the ends of a linear DNA can't be removed and replaced because there is no 3'-OH available. C. Since replication only initiates at the ends of linear DNA, the priming of each leading strand leaves a primer at the end that cannot be removed. D. Okazaki fragments are generated along both strands but DNA ligase is inhibited by the Tus-Ter complexes at the ends of the DNA. E. Primase cannot copy telomere DNA.
An animal with an open circulatory system ____
a. lacks a continuous network of blood vessels that contain the blood at all times b. can have only one heart
c. has two separate vascular circuits d. is able to distribute substances faster than a closed system e. can grow larger than one with a closed circulatory system
The cellular structure indicated by the arrow in the accompanying figure is responsible for:a
replication. b. protein synthesis. c. cellular respiration. d. digestion of unused organelles. e. lipid and fatty acid metabolism.
Fungi consist mainly of ________, which can become visible without a microscope
a. conidia b. mycelium c. fruiting bodies d. hyphae