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marusya05 [52]
3 years ago
14

HELP PLEASE I NEED ANSWERS ASAP

Biology
2 answers:
Amanda [17]3 years ago
7 0

Answer:

Explanation:

Those were my old notes hopefully it helps you!! goodluck.

Download pdf
Semenov [28]3 years ago
7 0
Cell membrane: controls what goes in or out, it’s like a guard (in all cells)

Cell wall: provides shape and support (only in plant cells)

Nucleus: cell’s control center, largest structure inside the cell, contains deoxyribonucleic acid (DNA)

Lysosomes: small structures that contain chemicals for breaking down food and waste for use or disposal (like a garbage truck)

Vacuoles: large sacs thats stores food and water (like a grocery store)

Endoplasmic reticulum: a maze of passageways that transport materials through the cell, has rough E.R. (has ribosomes) and has smooth E.R. (doesn’t have ribosomes)

Golgi apparatus: organelles that package and distribute proteins throughout the cell

Chloroplasts: green structure that convert the sun’s energy into food (carbohydrates), only found in plant cells
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______ are chemical messengers secreted by glands. Exocrine glands, such as sweat glands, secrete fluids through ducts. _______
rusak2 [61]

Answers:

Hormones are chemical messengers....

Endocrine glands secrete hormones...

The pituitary gland plays...

is produced by the adrenal glands...

the gland will produce fewer amounts of the hormone...

produce chemicals called paracrine factors...

blood is called the thyroid.

Steroid hormones are synthesized from cholesterol, while nonsteroid hormones are synthesized from modified amino acids and small peptides. Non-steroid hormones are not lipid-soluble and therefore they need to bind to a receptor on a cell membrane; while steroid hormones can diffuse through the cell membrane.

Explanation:

Hormones are signaling molecules synthesized by glands. The endocrine glands include the adrenal glands, pineal gland, thyroid gland, parathyroid gland, pituitary gland, ovaries, testes, pancreas and hypothalamus. The pituitary gland is an endocrine gland that secretes hormones capable of stimulating the adrenal glands in order to produce steroid hormones. Hormone levels are often modulated by negative feedback, by which high-hormone levels reduce their own production. Paracrine factors (also known as growth and differentiation factors) are proteins that can diffuse across small distances in order to induce responses in neighboring cells. The thyroid gland secretes hormones involved in regulating metabolism and growth. Moreover, the thyroid gland also secretes calcitonin that regulates calcium levels in the blood.

8 0
3 years ago
Proteins are denatured by elevated temperatures. Why are some proteins unable to renature when cooled?
umka21 [38]

Answer: protein conformation has been destroyed due to heat

Explanation:

Proteins are made up of several polypeptide chains linked by hydrogen bonds, and peptide bonds among their amino acids subunits.

At elevated temperatures, the hydrogen and peptide bonds are cleaved resulting in change in conformation of the protein. At this point, cooling DOES NOT renature the protein, as its bonds have been broken.

3 0
4 years ago
In fruit flies, straight wings are dominant and curly wings are recessive. What will the generations look like? Assume that Mend
Hunter-Best [27]

Answer: There will be one homozygous straight wing, two heterozygous straight wings, and one homozygous curly wing.

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3 0
3 years ago
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