both the mouth and the nasal passages lead to a hollow space at the back of the throat called the
What will be an ideal response?
pharynx
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In which order were the key features of complex multicellularity likely to have appeared?
A. cell adhesion, cell communication, regulated growth and development B. cell communication, cell adhesion, regulated growth and development C. regulated growth and development, cell communication, cell adhesion D. regulated growth and development, cell adhesion, cell communication
Which scenario is an example of positive feedback?
a. When oxygen levels are low, the kidneys secrete erythropoietin, which stimulates the proliferation and differentiation of red blood cells until oxygen demands are met. b. As blood pressure increases, specialized neurons relay the change to the brainstem, which in turn, decreases the contractility of the heart and leads to vasodilation, thereby decreasing blood pressure. c. After an injury, chemicals released at the site of injury will activate platelets, which will in turn activate additional platelets, and so on, until the clot has formed and the injury is no longer bleeding. d. When stress levels are high, the hypothalamus secretes corticotropin-releasing hormone (CRH), which in turn stimulates the secretion of adrenocorticotropic hormone (ACTH), which then triggers the release of cortisol. Increased cortisol levels then inhibit the release of CRH and ACTH. e. After eating, when glucose levels are high, insulin levels increase, leading to an increase in glycogen and fat synthesis to remove excess glucose from circulation.
Four of the five protists listed below are parasitic
Select the exception. a. Plasmodium spp. b. Amoeba proteus c. Giardia lamblia d. Trypanosoma brucei e. Phytophthora infestans
Non-protein coding genes are typically found in:
A) mitochondria. B) the nucleolus. C) the endoplasmic reticulum. D) the cytoplasm. E) areas of the nucleus other than the nucleolus.