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True or False
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1

It is possible for more than one sperm to fertilize an egg.
A)True
B)False
2

The zygote receives cytoplasm and organelles from the egg and sperm.
A)True
B)False
3

The first blood cells of the embryo are formed by the yolk sac.
A)True
B)False
4

The yolk sac provides nourishment for the developing human embryo.
A)True
B)False
5

Human gestation usually lasts for approximately 280 days.
A)True
B)False
6

The solid ball of cells of the pre-embryo is called a morula.
A)True
B)False
7

The purpose of therapeutic cloning is to produce a genetically identical individual; the purpose of reproductive cloning is to produce specialized cells.
A)True
B)False
8

An embryo that implants somewhere other than the uterus is called a clinical pregnancy.
A)True
B)False
9

The formation of the three (3) primary germ layers is through a morphogenic process called gastrulation.
A)True
B)False
10

Both the nervous and skeletal systems can trace their origin to ectoderm.
A)True
B)False
11

During the 5th week of embryonic development, it is possible to make out eyes, ears, and a nose.
A)True
B)False
12

All the organ systems have been established in the embryo by the 6th week of embryonic development.
A)True
B)False
13

The umbilical vein carries oxygen and nutrient poor blood to the placenta for exchange.
A)True
B)False
14

The fetal heartbeat is strong enough to be heard through a stethoscope during the 4th month of fetal devlopment.
A)True
B)False
15

The sex of an individual is determined at fertilization.
A)True
B)False
16

An individual with XX sex chromosomes cannot develop into a male.
A)True
B)False
17

Estrogen produced by the placenta can increase maternal resistance to insulin, resulting in pregnancy-induced (or gestational) diabetes.
A)True
B)False
18

False labor contractions are called Braxton Hicks contractions.
A)True
B)False
19

Onset and continuation of labor is due to negative feedback mechanisms.
A)True
B)False
20

The fact that a low-calorie diet can lengthen life span is explained by the mitochondrial hypothesis of aging.
A)True
B)False
21

The increased incidence of autoimmune diseases in older people seems to support the theory that aging is due to a lifetime of poor health habits.
A)True
B)False
22

The cross-linking of protein such as collagen contributes to several aging processes.
A)True
B)False
23

Neuron death may be due to oxygen deficiency rather than aging itself.
A)True
B)False
24

Although skeletal mass is lost as a part of aging, weight is gained due to conversion of muscle to fat and a lower basal metabolic rate.
A)True
B)False
25

Remaining active, both physically and mentally, is an important step in reducing many of the effects of aging.
A)True
B)False





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