Answer:
Atoms can join together - they form bonds together - to make MOLECULES. For example, two atoms of hydrogen hook together to form a molecule of hydrogen, H2 for short.
Explanation:
hopefully this helped i explained it the best i could
Answer:
b. They are carried throughout the body in the bloodstream, and each hormone affects target cells that have receptors for it.
Explanation:
Hormones are secreted by hormonal glands after they get signals to secrete or release the hormone. Then these hormones are carried by the bloodstream to their destination. Each hormone has its target organ or tissue which do not response to other hormones because it the cells in those tissue have specific receptor which binds to specific hormones.
For example, luteinizing hormone in male is produced by the pituitary gland which reach to the testis through blood and influence the Leydig cell to release testosterone. So Leydig cells have receptors for LH not for insulin hormone so it binds specifically to LH hormone. So the correct answer is b.
Answer:
The reason why animals <u>cannot synthesize oxaloacetate</u> is because the fatty acids which they produce, are not able to create glucose (oxaloacetate).
Explanation:
The fatty acids in animals need to be converted to acetyl-CoA first, but this acetyl won't convert into oxaloacetate, in comparison to plants, that use the glyoxylate cycle, that allows them to produce the mentioned glucose.
