Dinoflagellates
A usually reproduce sexually.
B. have protective cellulose plates
C. are insignificant producers of food and oxygen
D. have cilia instead of flagella
E. tend to be larger than brown algae
B. have protective cellulose plates
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Which of the following would NOT be an example of negative feedback control in homeostasis?
A. Blood volume and pressure drop due to bleeding. This decreased pressure causes the kidneys to increase water reabsorption to increase blood volume and pressure. B. Exposure to cold water causes body temperature to drop. Decreased stimulation of heat receptors causes constriction of blood vessels near the skin and better retention of heat. C. Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall. D. During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors. E. Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.
Which body feature in birds is a necessity to allow powerful flight muscles to operate?
a. a beak b. hollow, light-weight bones c. a cloaca d. an enlarged sternum with a protruding keel to bones of the upper limb. e. keen eyesight
Any light-driven reaction that attaches phosphate to a molecule is called __________. Fill in the blank(s) with the appropriate word(s)
Which early scientist proposed that cells arise only from pre-existing cells?
a. Theodor Schwann b. Robert Brown c. Matthias Schleiden d. Rudolf Virchow