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Flashcards in EXAM 1 Deck (74)
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1

Electronegativity is a measure of an atoms ability to attract a shared electron pair when it is participating in a covalent bond with another atom.

True

2

The production of a large molecule from smaller subunits is referred to as a catabolic reaction.

False; anabolic reaction

3

An enzyme is a biological carbohydrate-based catalyst.

False; protein-based

4

Cells can control metabolic processes by restricting the location of enzymes and enzyme complexes within the cell.

True

5

Aerobic cellular respiration requires that oxygen be present.

True

6

Cellular respiration results in the relatively rapid, uncontrolled release of energy from a molecule of glucose to produce ATP for use by cells for various function.

False; relatively slow, controlled

7

Enzymes lower activation energy.

True

8

Ribosomes move along mRNA in a 5'-->3' direction.

True

9

Some restriction endonucleases make zigzag cuts in double-stranded DNA leaving blunt cells.

False; leaving sticky ends

10

Contractions that increase in strength during pregnancy are an example of a negative feedback mechanism.

False; positive feedback mechanisms

11

Kidney's remove waste, balance blood pH, and maintain water balance.

True

12

Wastes are filtered from the blood by the kidneys and conducted to the urinary bladder by the urethra.

False; ureter

13

A cross section of the kidney shows an oiter layer called the medulla, an inner layer called the cortex, and a hollow chamber called the renal pelvis.

False; outer layer called the cortex, inner layer called the medulla

14

When a person sweats and does not drink water, the pituitary gland releases ADH.

True

15

Insulin is produced in a healthy person when blood sugar is low.

False; blood sugar is high

16

People with diabetes feel tired because of low levels of glucose in the blood.

False; low levels of insulin

17

As follicles develop in the ovary, estrogen concentration in the blood decreases.

False; increases

18

Information from your brain is moved to your leg muscles by motor neurons.

True

19

Myelin sheath is very important for the transferring of information along the medulla.

False; axon

20

Electrochemical messages are carried by the movement of ions through the nerve membrane.

True

21

When the nerve cell is excited, it becomes more permeable to potassium ions than sodium ions.

False; sodium ions then potassium ions

22

Sharks, snakes, and crocodiles are able to grow new teeth all of their lives. This is considered to be an example of analogous structures.

False; homology

23

Islands are very important places in which speciation occurs because the populations they contain are spatially isolated from other populations.

True

24

Over time, the total number of species in existance deos not change.

False; changes

25

A species is a group of individuals that are reproductively compatible with each other but not with individuals from other groups.

True

26

The following structural formula is representative of which functional group?
-C=O
\
O
|
H

carboxyl

27

An amino acid always has an amino group, as its name suggests. What other group is also present in all amino acids?

a carboxyl group

28

The hydrolysis (breakdown) of a dipeptide results in the production of which of the following?

Two amino acids

29

In aerobic respiration, which is a typical oxidation/reduction reaction, the energy...

Required for reduction is the same as that released in oxidation

30

The key point about oxidation is that it is a process in which....

There is a loss of electrons