Fire results in the production of ash from vegetation and soil organic matter. This ash contains nutrients that are most often
A) lost from ecosystems almost immediately following the fire.
B) devoid of elements required for plant growth.
C) unavailable for mineralization causing nutrient retention in the system.
D) available for plant uptake and vulnerable to loss if not taken up by recovering vegetation.
D
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You are examining the effect of maturation-promoting factor (MPF) in sea urchin cells, which have a diploid number of 36. If you fuse a dividing sea urchin cell with a G1 arrested oocyte, what would be the outcome?
A. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated. B. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes. C. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes. D. The G1 cell would first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about MPF? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When Ca2+ diffuses into the cytoplasm of muscle cells and initiates the crossbridge cycle without a neurotransmitter
trigger, the animal is most likely stressed.
Indicate whether the statement is true or false.Most of the cellular component of blood is composed of _____ blood cells, which do not have _______
a. red; nuclei b. red; carbonic anhydrase c. white; nuclei d. white; carbonic anhydrase e. white; hemoglobin
Which of the following is not a characteristic of B cells?
A) They carry out cell-mediated immunity. B) They originate in bone marrow. C) They are responsible for the memory response of humoral immunity. D) They are responsible for antibody formation. E) They have antibodies on their surfaces.