| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
Changes to an object's speed or direction of motion are caused by which of the following?
work |
|
power |
|
a force |
|
kinetic energy |
Force is applied to change an object's speed or direction of motion.
Which of these is not a component of blood?
white blood cells |
|
marrow |
|
red blood cells |
|
plasma |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
products |
|
ions |
|
reactants |
|
isotopes |
The atomic mass of an element listed in the Periodic Table represents the average mass of a single atom of that element and is measured in atomic mass units (amu). This number is an average as some elements have isotopes with atoms that vary in their number of neturons and, therefore, differ in weight.
In the Periodic Table of the Elements, atomic number is equal to which of the following?
number of electrons orbiting the nucleus |
|
number of protons in the nucleus |
|
number of neutrons in the nucleus |
|
number of protons + neutrons in the nucleus |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
Gametes have how many pairs of chromosomes?
23 |
|
4 |
|
2 |
|
46 |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.