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xenn [34]
3 years ago
9

What does it mean for a membrane to be selectively permeable

Biology
1 answer:
choli [55]3 years ago
6 0

Answer: Definition of Selectively Permeable Membranes. All cells are enclosed with a cell membrane. A selectively permeable cell membrane is one that allows certain molecules or ions to pass through it by means of active or passive transport.

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Match the following. 1. an act of fertilization involving the transfer of cell contents to another cell; usually occurs in simpl
Nuetrik [128]

Answer:

1. Conjugation

2. Diploid

3. External fertilization

4. Fertilization

5. Haploid

Explanation:

Conjugation is a cell-to-cell encounter between bacteria cells. The bacteria come close to each other and DNA is then transferred through a tube-;ike structure called pilius.

The difference between diploid and haploid is that diploid organisms have chromosomes that come in pairs. The chromosomes are paired up with another chromosome that is similar in shape and size and that is why they are called homologous pairs. Haploid on the other hand do not come in pairs. In human beings for example, the egg cell and sperm cell are haploid, only having one homologous chromosome. When they join together during fertlization, they form a diploid.

Fertilization is the union of gamete cells, male and female, which result in the formation of a zygote. There are two types of fertilization, internal and external. Internal fertilization occurs when the union of the sex cells (gametes) occur inside the organism. You would see this in humans, where fertilization occurs in the womb. External fertilization occurs when the union occurs outside the organism and a good example of this would be fish. The female expels it's eggs into the water and the male would release its own sex cells as well, and they would join in the water.

7 0
4 years ago
Chlorenchyma and aerenchyma are modified ____________ (a) phloem (b) sclerenchyma (c) collenchyma (d) parenchyma
Alexxandr [17]

They are D) modified parenchyma

6 0
3 years ago
Which of the following is not an example of scientific model
Anni [7]
A scientific model is a claim or a theory that helps explain how a phenomenon works or how it undergoes process. This models provides scientists an understanding of the object or a situation undergoes change and generate certain outcomes or effects.

4 0
4 years ago
What is the chemical reaction used to study enzyme activity in the lab (lactase breaking down lactose into its monomers). Know t
Bas_tet [7]

Answer: The chemical reaction in this example is Called hydrolysis in the presence of Lactase

Here is a word equation for the hydrolysis of lactose:

lactose + water → galactose + glucose

Explanation: The equation is called <hydro> + <lysis) of these terms refer to water and splitting respectively. So hydrolysis means splitting with water. Enzymes pull out a monomer by examining where the monomers are connected, and placing a water molecule in between them, resulting in the breakage of the bond between the monomers. Here are two picture to represent it.

6 0
3 years ago
Help plz:
just olya [345]

Answer:

Us humans discovered technology to change the way of life at its best, now the technology at every second is changing our's lives. Over the years, technology has successfully attempted to enter our body and change the way of thinking, and the target is human blood and emotions.

Explanation:

please mark me brainlest

7 0
3 years ago
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