| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.53 |
| Score | 0% | 71% |
Which of the following is not a method of heat transfer?
convection |
|
reflection |
|
radiation |
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conduction |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
In cell biology, cytokinesis results in two separate:
chromosomes |
|
chromatids |
|
nuclei |
|
cells |
During cell division, the cytokinesis phase occurs when cytoplasm and cell membranes complete their separation resulting in two separate cells.
Which of the following describes how a person's genes express themselves in physical characteristics?
phenotype |
|
chromotype |
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DNA |
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genotype |
A person's genotype is their genetic makeup and includes both dominant and recessive alleles. Phenotype is how the genes express themselves in physical characteristics.
Plant cells are surrounded by:
only a cell membrane |
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a cell membrane and a cell wall |
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neither a cell membrane nor a cell wall |
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only a cell wall |
Animal cells are surrounded by a semipermeable membrane which allows for the transfer of water and oxygen to and from the cell. In plant cells, the cell membrane is surrounded by a somewhat rigid cell wall which provides the cell structure and support.
Carbohydrates are found in:
animal sources |
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vegetable oils |
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sugars and starches |
|
food additives |
Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).