Which cells form flexible support strands such as the "strings" in celery?
a. sclerenchyma cells
b. tracheids cells
c. collenchyma cells
d. parenchyma cells
Answer: c. collenchyma cells
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Match the following lymphatic organs to the proper function
A) Red bone marrow 1) site of T cell maturation B) Lymph nodes 2) help prevent the entrance of pathogens through the nose and mouth. C) Thymus 3) cleanse the blood and storage of lymphocytes D) Spleen 4) cleanse the lymph and alert the immune system to pathogens E) Tonsils 5) site of blood cell production
During ____ between predator and prey species, the predatory species becomes more efficient at catching prey, while
the prey species becomes better at escaping predators. a. character displacement b. coevolution c. Batesian mimicry d. competitive exclusion e. succession
The first amino acid added to a polypeptide is methionine but it will have internal methionines as well. Why are separate tRNAs for methionine used for translation initiation and elongation, and how are they distinguished by the ribosome?
What will be an ideal response?
In general, a seed is a:
A) protected plant embryo with a food supply. B) a large spore that grows into the gametophyte. C) plant ovary. D) reproductive structure that requires pollen to become active.