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Cell Biology
The main component/(s) of plasma membrane are?
1) lipid and proteins
2) phospholipids
3) cellulose and proteins
4) cellulose and lipids
1) lipid and proteins
2) phospholipids
3) cellulose and proteins
4) cellulose and lipids
Cell Biology
The second law of thermodynamics states that when energy is converted from one form to another, the amount of useful energy decreases. How does this relate to energy flow through biological systems?
Choices are:
Animals need to absorb solar energy (heat) to metabolize biological molecules for the energy they contain.
As energy is passed from producer to consumer, some energy is lost as heat
A biological system cannot create or destroy energy.
As producers, plants must liberate heat as they synthesize carbohydrates
Choices are:
Animals need to absorb solar energy (heat) to metabolize biological molecules for the energy they contain.
As energy is passed from producer to consumer, some energy is lost as heat
A biological system cannot create or destroy energy.
As producers, plants must liberate heat as they synthesize carbohydrates
Cell Biology
What is the term used to describe organisms that capture solar energy and release oxygen as a by-product?
Choices are:
A)producers heterotrophs
B) carnivores
C) primary consumers
D) tertiary consumers
Choices are:
A)producers heterotrophs
B) carnivores
C) primary consumers
D) tertiary consumers
Cell Biology
How is the energy radiated to Earth from the sun captured for use by life-forms on Earth?
Choices are:
It is captured by the inorganic substances found on Earth.
It is absorbed as heat by Earth and this is converted to energy used by life-forms.
It is captured by animals that subsequently make it available to plants.
It is captured by photosynthetic organisms.
Choices are:
It is captured by the inorganic substances found on Earth.
It is absorbed as heat by Earth and this is converted to energy used by life-forms.
It is captured by animals that subsequently make it available to plants.
It is captured by photosynthetic organisms.
Cell Biology
What is the definition of "nutrients"?
Choices are:
Nutrients are the heat, light, and ultraviolet rays that reach Earth, which are utilized in chemical reactions to power life
Nutrients are atoms and molecules that organisms obtain from their living or nonliving environment and that are required for survival.
Nutrients are the pigment molecules that absorb specific wavelengths of sunlight, which subsequently store energy in chemical bonds.
Nutrients are molecules that collect and store energy
Choices are:
Nutrients are the heat, light, and ultraviolet rays that reach Earth, which are utilized in chemical reactions to power life
Nutrients are atoms and molecules that organisms obtain from their living or nonliving environment and that are required for survival.
Nutrients are the pigment molecules that absorb specific wavelengths of sunlight, which subsequently store energy in chemical bonds.
Nutrients are molecules that collect and store energy
Cell Biology
Which of the following answer choices is a true statement?
The pituitary gland has multiple functions related to the endocrine system.
Secretory cells of an endocrine gland are embedded in muscle tissue.
An endocrine gland is a cluster of hormone-secreting cells surrounded by a network of capillaries.
Target cells produce hormones that are transported throughout the body by the circulatory system.
The pituitary gland has multiple functions related to the endocrine system.
Secretory cells of an endocrine gland are embedded in muscle tissue.
An endocrine gland is a cluster of hormone-secreting cells surrounded by a network of capillaries.
Target cells produce hormones that are transported throughout the body by the circulatory system.
Cell Biology
The kidneys detect low blood oxygen levels and respond by releasing the hormone erythropoietin, which stimulates the bone marrow to make more red blood cells. As a result, the number of red blood cells increases, so more oxygen is carried in the blood. This is an example of which of the following?
positive feedback
synaptic feedback
neutral feedback
negative feedback
positive feedback
synaptic feedback
neutral feedback
negative feedback
Cell Biology
Which of the following hormones is a major player in the regulation of appetite?
atrial natriuretic peptide
thymosin
melatonin
leptin
atrial natriuretic peptide
thymosin
melatonin
leptin
Cell Biology
The pancreas is often described as a dual-function gland because it has both endocrine and exocrine functions. What is its exocrine function?
to regulate the amount of calcium in the bloodstream
to promote digestion by releasing bicarbonate and enzymes into the small intestine
to regulate the amount of water in the bloodstream
to absorb vitamins from nutrients passing through the small and large intestines
to regulate the amount of calcium in the bloodstream
to promote digestion by releasing bicarbonate and enzymes into the small intestine
to regulate the amount of water in the bloodstream
to absorb vitamins from nutrients passing through the small and large intestines
Cell Biology
Islet cells from a donor are injected into a patient with diabetes. If successful, the donor islet cells would release insulin into the bloodstream to regulate blood glucose levels. Why would this treatment NOT cure type 2 diabetes?
islet cells would produce only insulin, not glucagon, which would also be required to regulate blood glucose
in type 2 diabetes, glycogen is lacking, not insulin
islet cells would produce digestive enzymes instead of insulin
in type 2 diabetes, insulin is still produced, but the target cells do not respond
islet cells would produce only insulin, not glucagon, which would also be required to regulate blood glucose
in type 2 diabetes, glycogen is lacking, not insulin
islet cells would produce digestive enzymes instead of insulin
in type 2 diabetes, insulin is still produced, but the target cells do not respond
