Which of the following statements about the sporophyte in brown algae is true?
a. It is diploid and gives rise to spores by meiosis.
b. It is diploid and gives rise to spores by mitosis.
c. It is haploid and gives rise to spores by meiosis.
d. It is haploid and gives rise to spores by mitosis.
e. It is triploid and gives rise to endosperm by mitosis.
A
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The bulk of the reabsorption of useful materials by the kidney takes place in the
A. renal corpuscle. B. proximal convoluted tubule. C. loop of Henle. D. distal convoluted tubule. E. collecting ducts.
Genetic mapping experiments performed by Seymour Benzer on rII mutants in the T4 phage showed that the gene is indivisible by the process of mutation and recombination
Indicate whether the statement is true or false
The production of red blood cells is regulated by a feedback loop involving erythropoietin. In non-disease states, the production of red blood cells is equal to the destruction of red blood cells, thus maintaining sufficient red blood cells to deliver adequate oxygen to the body's tissues. However, when the number of red blood cells decrease and oxygen levels are low, erythropoietin is produced by the liver and kidneys to increase the production of red blood cells. Is this a positive or negative feedback loop? Explain your answer.
What will be an ideal response?
A population becomes isolated from other populations of the same species, and then genetic divergence occurs that prevents them from breeding with other populations. What has happened?
A) directional selection B) formation of genetic drifts C) mechanical incompatibility D) speciation