Answer:
In many mammals, a developing embryo is nourished through the placenta. ____ is a connection with the mother. Later, a newborn takes in food produced by the blood artilleries of the mother. Unlike a young mammal, an insect or amphibian undergoes metamorphosis which is a series of dramatic changes in body shape and form.
This membrane is called a selectively permeable membrane as it only allows for the entry of specific substances and does not allow of others.
Answer:
The answer is class and family.
Explanation:
Taxonomic groups are used for biological classification. There are eight main taxonomic groups: domain, kingdom, phylum, class, order, family, genus and species, with the domain as the most inclusive and species as the least inclusive. If we take a look on Mammalia and Hominidae classification, we can assume that Mammalia represents class, and Hominidae represents family:
1. Domain: Eukarya
2. Kingdom: Animalia
3. Phylum: Chordata
4. Class: Mammalia
5. Order: Primates
6. Family: Hominidae
7. Genus: Homo
8. Species: Homo sapiens
to understand what the result of these crosses would be like, we need to know what is gene
<h3>Gene</h3><h3 />
The gene is a strand of a DNA molecule (deoxyribonucleic acid), which carries the characteristics that are genetically inherited. They are composed of a sequence of DNA and RNA (ribonucleic acid), responsible for the production and synthesis of proteins in the cell. The gene's greatest attribution, therefore, is to be a store and transmitter of information.
Genes can be classified into:
- Dominant genes: assume the specific characteristic in the offspring;
- Recessive genes: manifests itself in the absence of the dominant gene;
- Structural genes: are those that contain the information that will determine the structure of living beings;
- Operator gene: acts on the functioning of other genes;
- Regulatory gene: responsible for controlling the synthesis and transcription of other genes.
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in genetics, are individuals who have pairs of genes that are identical or different alleles. This means that while the has two identical genes alleles, with the beings the opposite happens, since they have two different genes alleles.
with this information we can say that a white and short plant, when crossed with a plant for both traits, has 60% of this plant being with expression of the dominant genes and 40% of being with expression of the recessive gene.
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Answer:
The statement is true since one of the main functions of the enzyme is to lower the activation energy so that a chemical reaction to proceed.
Explanation:
Enzymes are specialized protein molecules that contribute to faster chemical reactions. One of the functional characteristics of an enzyme is that it reduces the activation energy for a reaction to occur.
Activation energy is the amount of net energy required for a reaction to occur. By lowering the activation energy, a reaction occurs faster, which is achieved with a biocatalyst such as enzyme.