The statement that describes the ability of the cell membrane to allow various substance to move through is that the cell membrane is preamble and allows only certain substances to pass through.
Explanation:
The plasma membrane is preamble, hydrophobic molecules and small polar molecules diffuse through lipid layer. The integral membrane proteins enable large polar molecules to pass through the membrane.
Some molecules can cross the membrane like hydrocarbons and oxygen. Whereas the large molecules like glucose and sugars cannot cross. The water pass through lipid.
The given statement saying it is proper to put away the knives and the cups in the drawers after towel drying them is false. Towel drying them will make them susceptible to the bacteria. It is better that the utensils should be air-dried. The towel may contain a lot of the microorganisms. They cling to the moist and get transferred to the utensils when the towel is used to dry those dishes.
Hence, the answer is 'false'.
Answer:
a. Independent Variable: throwing clothes (i.e., the bedroom)
b. Dependent Variable: how clean the floor is
c. Control Variable: throwing clothes into the air
Explanation:
The independent variable is a variable that isn't modified by the other variables measured in the experiment. Conversely, the dependent variable is the variable measured in the experiment which is 'dependent' on the independent variable. Finally, the control variable is a variable that is constant (i.e., unmodified) throughout the course of the experiment.
Our perception of the brightness of a color is affected mainly by: the amplitude of light waves.
Night and peripheral vision depend mainly on rods, while daylight and acute vision depend mainly on cones.
The amount of light entering the eye is regulated by changes in the size of the pupil.
If you project a red, a green, and a blue light into space, the point at which the three lights cross will lead to the perception of white light.
eric has been wearing red welding goggles for the past 30 minutes. Based on the opponent-process theory of color vision, when Eric takes off the red goggles, he should expect that objects will temporarily appear to be green.
Answer
When a eukaryotic cell is not undergoing mitosis, the DNA and its associated proteins appear as a visible network of dark fibers called the Chromatin.
Definition
Chromatin is a thread like structure that can be seen inside nucleus before cell division. It is a complex of DNA and histone proteins.
Forms of chromatin
Chromatin exist in two forms, that is
a. Euchromatin
It is less condensed and can be easily transcribed.
b. Heterochromatin
It is highly condensed and not transcribed as easy.
Organization of chromatin
Microscopy has shown the appearance of chromatin as beads on a string. The beads are called nucleosomes.
Nucleosome
Each nucleosome is composed of DNA wrapped around eight histone proteins. The nucleosome is then wrapped into a 30nm spiral called solenoid.
