Endochondral ossification involves:
A. the formation of bones from a cartilage
model.
B. the formation of bones from a collagen
model.
C. the formation of bone tissue directly from
osteoblasts laying down bone material.
D. the transformation of spongy bone to
compact bone.
E. the formation of flat bones such as those
that make up the skull.
A
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Which of the following statements about the interactions between the hypothalamus and pituitary is false?
a. Most hypothalamic hormones that act on the anterior pituitary are releasers that encourage secretion of hormones by target cells b. The hypothalamus has some neurons whose axons extend into the pituitary's posterior lobe. c. The posterior lobe of the pituitary secretes hormones made in the hypothalamus. d. Antidiuretic hormone (ADH) and oxytocin are synthesized in the cell bodies of neurons in the anterior pituitary.
When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
A) relay molecule B) transducer C) signal molecule D) response molecule
All of the following statements describe eukaryotic cells EXCEPT:
A. Their plasma membrane usually contain Sterols and carbohydrates B. They have membrane-bound organelles (example include mitochondria and endoplasmic reticulum) C. They have 80S ribosomes (70S in organelles) D. They have usually a single circular chromosome E. They may possess a cell wall but not of peptidoglycan
Fructose and galactose both have six carbon atoms, twelve hydrogen atoms and six oxygen atoms, just like glucose. A friend of yours says: "Since those sugars have the same number of atoms, they should have the same name." You answer: "While they do have the same number and type of atoms,
A. they are named differently because they have different secondary structure." B. they are named differently because they cannot be converted into glucose." C. they are named differently because one is found in RNA and the other in DNA." D. they are named differently because they are isomers of the monosaccharide, glucose." E. they are all polysaccharides and have slightly different functions within organisms and therefore have different names."